RFC: Add helper to easily enable core dumps

lib/datadog/enable_core_dumps.rb

@@ -0,0 +1,40 @@
+# This helper is used to enable core dumps for the current Ruby app. This is useful when debugging native-level
+# crashes.
+#
+# It can be enabled simply by adding `require 'datadog/enable_core_dumps'` to start of the app.
+
+lambda do
+  current_size, maximum_size = Process.getrlimit(:CORE)
+  core_pattern =
+    begin
+      File.read('/proc/sys/kernel/core_pattern').strip
+    rescue
+      '(Could not open /proc/sys/kernel/core_pattern)'
+    end
+
+  if maximum_size <= 0
+    Kernel.warn("[DDTRACE] Could not enable core dumps on crash, maximum size is #{maximum_size} (disabled).")
+    return
+  elsif maximum_size == current_size
+    Kernel.warn('[DDTRACE] Core dumps already enabled, nothing to do!')
+    return
+  end
+
+  begin
+    Process.setrlimit(:CORE, maximum_size)
+  rescue => e
+    Kernel.warn(
+      "[DDTRACE] Failed to enable core dumps. Cause: #{e.class.name} #{e.message} Location: #{Array(e.backtrace).first}"
+    )
+    return
+  end
+
+  if current_size == 0
+    Kernel.warn("[DDTRACE] Enabled core dumps. Maximum size: #{maximum_size} Output pattern: '#{core_pattern}'")
+  else
+    Kernel.warn(
+      "[DDTRACE] Raised core dump limit. Old size: #{current_size} " \
+      "Maximum size: #{maximum_size} Output pattern: '#{core_pattern}'"
+    )
+  end
+end.call